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. 2009 Nov 4;298(1):R79–R88. doi: 10.1152/ajpregu.00053.2009

Table 1.

Means ± SE energy expenditure and bicycle ergometry data

Wtinitial Wt−10% Wtinitial Wt+10%
24 h energy expenditure (TEE)
    kcal/24 h 3100±155 2436±113* 2470±166 2985 (186)†
    kcal/kg FFM 49.4±1.1 41.4±1.3* 45.3±1.1 52.8 (1.6)†
Resting energy expenditure (REE)
    kcal/24 h 1827±96 1663±84* 1582±84 1655 (107)
    kcal/kg FFM 29.2±0.9 28.3±1.0 29.1±1.1 29.3 (1.2)
Nonresting energy expenditure
    kcal/24 h 1175±86 691±66* 813 (84) 1243 (77)†
    kcal/kg FFM 18.6±1.1 0.008±0.001* 14.8 (0.8) 22.0 (0.05)†
Thermic effect of feeding (TEF)
    kcal/day 98±8 82±13 86 (6) 102 (14)
    % caloric intake used in TEF 3.2±0.2 3.6±0.4 3.5 (0.3) 3.3 (0.4)
Anaerobic Threshold
    ml O2/min 1293±55 1288±51 1492 (66) 1406 (79)
    ml O2·kg FFM−1·min−1 21.8±1.2 24.0±1.4 27.1 (2.2) 24.6 (2.3)
Energy expenditure, kcal/min
    Watts
        0 1.27±0.07 1.15±0.06 1.10 (0.06) 1.15 (0.08)
        10 2.83±0.23 2.36±0.18* 2.43 (0.18) 3.18 (0.15)†
        25 3.65±0.22 3.18±0.18* 3.26 (0.19) 3.97 (0.13)†
        50 5.08±0.19 4.71±0.25‡ 4.64 (0.23) 5.17 (0.15)
Energy expenditure, kcal/min-REE
    Watts
        10 1.68±0.20 1.33±0.16* 1.33 (0.19) 2.03 (0.19)†
        25 2.51±0.17 2.16±0.16* 2.16 (0.21) 2.92 (0.19)
        50 3.88±0.16 3.68±0.23 3.53 (0.24) 4.03 (0.18)
Energy expenditure, kcal·kg−1 FFM·min−1–REE
    Watts
        10 0.029±0.002 0.026±0.003‡ 0.026 (0.006) 0.038 (0.007)
        25 0.046±0.003 0.043±0.003† 0.041 (0.008) 0.053 (0.008)
        50 0.071±0.004 0.073±0.005 0.067 (0.008) 0.074 (0.010)
Respiratory exchange ratio
    Watts
        0 0.85±0.01 0.85±0.01 0.84 (0.02) 0.85 (0.03)
        10 0.83±0.01 0.81±0.01‡ 0.81 (0.02) 0.83 (0.03)†
        25 0.85±0.01 0.84±0.01 0.86 (0.03) 0.87 (0.03)
        50 0.88±0.02 0.88±0.02 0.89 (0.03) 0.88 (0.03)
Efficiency, kcal work/kcal energy expended–REE
    Watts
        10 0.114±0.017 0.131±0.012* 0.115 (0.018) 0.071 (0.006)†
        25 0.151±0.020 0.177±0.013‡ 0.173 (0.018) 0.129 (0.008)
        50 0.189±0.008 0.204±0.012 0.207 (0.015) 0.179 (0.007)

Means ± SE energy expenditure, fitness, fuel utilization, and efficiency. Energy expenditure during exercise is expressed as total calories expended, total calories expended above resting (i.e., total calories expended solely as a result of exercise), and total calories expended above resting per unit of fat-free mass (FFM). Thirty subjects (18 obese, 7 never-obese; 12 males, 13 females) were studied at Wtinitial and Wt−10%. Five subjects (4 never-obese males; 1 never-obese female) were studied at Wtinitial and Wt+10%.

*

P < 0.001 compared to Wtinitial;

†

P < 0.05 compared to Wtinitial;

‡

P < 0.01 compared to Wtinitial.